My feelings are mixed.
I don't mind current placements of US forces, save a few places. Bases in Saudi Arabia, East Africa, Kuwait, Diego Garcia, and the Pacific are very useful in rapid response situations, though many bases, such as those in England and Western Europe, we could do without. The US is maintaining a very flimsy yet relatively balanced system of power and projection. Not nearly as much as they boast, but still a good system nonetheless.
I think intervention in Libya in 2011 was pointless, the Iraq War was pointless and immoral (not so say war is ever really "moral"), and I'm glad we're pulling out of Afghanistan, Afghanistan not being a worthwhile effort since the Taliban regained ground in 2007 (though the initial war did succeed in ousting al-Qaeda from the country, more or less). I doubt peacekeepers are as necessary in the Balkans as they were 13 years ago, and likewise see little point in keeping people there either.
As far as "interventionist" policies go, I think they can be useful when used correctly. But the fact is they aren't. Every war the United States and its allies have entered since Korea has been grossly misguided, save the Gulf War, which itself failed to do away with Saddam Hussein when it had the chance. The Afghanistan War may have pushed the Taliban and al-Qaeda out of that country in 2001-02, but it didn't incapacitate them, which is why the Taliban only had to rearm in Pakistan and return to fight in 2006 or 7, leading to the tangled mess we're pulling out of now. If we're going to liberate, secure, occupy, or whatever it is we want to do in all these countries, we need to strike hard and fast from the beginning, not "build-up", limit ourselves, or allow less capable military's do it for us for the sake of image (as was the case in Afghanistan. See "Afghan Northern Alliance").
Interventionism as a principle is also a very dangerous policy. Again, the immediate effect of interventionism may be useful for those countries it affects. But the long term effects cause severe resentment of invading powers. For example, the misguided continuation of the war in Vietnam gave the North Vietnamese and Viet Cong all the more reason to remove the US from their country. And not to mention Osama bin Laden claimed that it was US placement of troops in Saudi Arabia, what he called "holy ground", and the Gulf War that inspired him to make the call for Jihad that led to the 9/11 attacks.
I don't think interventionism is an overall wrong, but I do think that until the US DOD can pull their inflated head from their ass, learn from their mistakes, and learn to fight wars effectively, we should stay much closer to home. I also think that the threat to our country or our ally(s) needs to be much greater than it has been before considering military action.
EDIT: Oh yeah, unless it's a blatant genocide like Nazi Germany or 1990s Somalia, if the people in a "country of interest" don't want you there, it's not worth it.
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I Like Trains.